@mixin abs-all($width, $height, $left, $top){
	position: absolute;
	width: $width;
	height: $height;
	top: $top;
	left: $left;
}

@mixin abs($left:0, $top:0){
	position: absolute;
	top: $top;
	left: $left;
}

@mixin setBg($url, $width:100%, $height:100%){
	width: $width;
	height: $height;
	background:url($url) no-repeat top center;
	background-size: $width $height;
}

@mixin fillBg($url, $width, $height){
	width: ptr($width);
	height: ptr($height);
	background:url($url) no-repeat top center;
	background-size: ptr($width) ptr($height);
}

@mixin absVO($left:0, $top:0){
	position: absolute;
	top: ptr($top);
	left: ptr($left);
}

@mixin marginCenter($width, $color){
	width: ptr($width);
	margin: 0 auto;
	background-color: $color;
}

@mixin marginCenterHeight($width, $height, $color:#fff){
	width: ptr($width);
	height: ptr($height);
	margin: 0 auto;
	background: $color;
}